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Prepaid Expenses and Other Current Assets (Tables) | 12 Months Ended
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Dec. 31, 2012
Prepaid Expense and Other Assets [Abstract] |
Schedule of Prepaid Expenses and Other Current Assets | Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets are summarized as follows as of December 31, 2012 and 2011:
(in thousands) | 2012 |  | 2011
Prepaid expenses | $ | 30,354 |  |  | $ | 27,832 |
Amounts held in escrow in connection with acquisitions | 7,521 |  |  | 7,026 |
Value added tax | 10,221 |  |  | 9,488 |
Other receivables | 7,267 |  |  | 14,709 |
| $ | 55,363 |  |  | $ | 59,055 |

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